Polishing-body for burnishing-barrels.



J. C. ANDREWS.

POLISHING BODY FOR BURNISHING BARRELS.

APPLICATION FILED NOV- 7| 1916.

1 ,21 8, 1 58. Patented Mar. 6, 1917.

V I 951 61 Hem L213 s 6] l weutoz UNITED STATES PATENT OFFICE.

JOSEPH C. ANDREWS, OF NEW BRITAIN,

CONNECTICUT, ASSIGNOR TO AMERICAN HARDWARE CORPORATION, OF NEW BRITAIN,CONNECTICUT, A CORPORATION OF Patented Mar. 6, 1917.

CONNECTICUT. POLISHING-BODY FOR BURNISHING-BARRELS.

1 218 158 Specification of Letters Patent.

Application filed November 7, 1916. Serial No. 129,936.

To all whom it may concern:

Be it known that I, JOSEPH C. Aiipnnws, a citizen of the United States,residlngat New Britain, county of Hartford, State'of Connecticut, haveinvented a certain new and useful Improvement in Polishing- Bodies forBurnishing-B'arrels, of which the following is a full, clear, and exactdescription.

My invention relates to improvements in polishing bodies for-use inburnishing barrels, and has for its object to produce a tumblingelement, which is adapted to'contact with surfaces having varyingcurvatures and irregularities on the object to be burnished, withoutbeing liable to enter or be caught in holes or corners, and consists ofa special shaped tool composed of a solid body of hard metal, formedwith a central spheroid section, and having'conoidal extensions at twopoints,each extension having a rounded end and at its base flaringoutward in a curve to join the surface of the central spheroid.

The following is a description of an embodiment of my invention,reference being had to the accompanying drawing, in which Figure 1 showsa side elevation of a pol ishing body embodying my invention;

Fig. 2 is an end view of the same.

Referring more particularly to the drawings, thetool is made up of acentral portion 1 in the shape of a spheroid on the opposite sides ofwhich are conoidal extensions 2-2, each having a blunt rounded end 3,and flaring abruptly outward at its base 4'in a curve to join thesurface of the central spheroid. The surface of the tool as a whole ispreferably a surface of revolution about an axis passing through thecenters of endsof the two conoidal extensions. The sides of theextensions are substantially parallel, except near their bases, so thattheir body portions are substantially cylindrical and do not tend towedge in any opening in which the ends can easily enter, so as to beloose therein. The absence of a taper near the ends prevents wedging atthose portions, unless the articles being polished have holes into whichthe ends will tightly fit, and the abrupt flaring near the base of theextensions prevents those portions from acting as wedges, which would beliable to become stuck in any openingi Even 1f the artlcles beingpolished had openings in which the ends of the extensions might enterand fit closely, there would be small chance.

of having the extensions enter such holes. The chance of having the endsso enter such holes would be much less than if the ends had aconsiderable taper.

This special shaped tool will burnish articles havlng angular or curvedsurfaces, and

because of its large central portion will not enter and become caught inholes of less diameter than the s heroid and ubstantially larger thanthe end of the extensions, or in corners of the articles with which itis used, while the small diameter of the ends permits the ends tosuccessfully burnish the angles and curves.

By its use one is not obliged to have available for burnishing so manydifferent sized balls since the presence of the central spheroid and therounded ends of the conoidal extensions provide surfaces of a largediameter and a small diameter in the same device, so that the singlespecial shaped polishing device offers a combination of large and smallrolling surfaces. In case articles such as metallic door knobs, havinglarge holes for the shanks, are to be polished, the I bodies are made sothat the central spheroid is of such size as not to enter the holes. Ifthere are also smaller holes the bodies used should have ends of eitherlarger diameters than those holes or of considerably smaller diameters,the proportions of spheroid and extensions being preferablysubstantially as shown. The presence of the conoidal extensions ofsmaller diameter permit the device to contact with reentrant curved anda greater variety of Work With a smaller number of sizes of polishingelements, and, furthermore, the pohshmg elements, by reason of theflaring curves at the bases of the conoidal extensions, make a moreextended It is preferable to have two conoidal extensions, and havethese conoidal extensions extend along a common axis, since they therebytend to balance each other, although some of the advantages can beobtained where the conoidal extensions are not in line with the sameaxis or where one of them is omitted. For many purposes it is desirableto have the spheroid section sevensixteenths of an inch in diameter, andto make the total length one inch. These dimensions and proportions,however, may be varied to meet varying conditions.

A will be evident to those skilled in the art, my invention permits ofvarious modifications, without departing from the spirit thereof, or thescope of the appended claims.

What I claim is:

1. A metal polishing-body for tumblingbarrels, which has avspheroidalportion and a conoidal extension therefrom, said conoidal extensionhaving a surface at its base, curved so as to abruptly flare outwardlyto join the surface of the spheroidal portion.

- 2. A metal" polishing-body for tumblingbarrels, which has a spheroidalportion and two conoidal extensions therefrom, each conoidal portionhaving a curved surface at its base, so as to abruptly flare outwardlyto join the surface of the spheroidal portion and a substantiallycylindrical portion between its end and said spheroidal portion.

3. A metal polishing-body for tumblingbarrels, which has a spheroidalportion and two conoidal extensions therefrom, each conoidal portionhaving a curved surface at its base, so as to abruptly flare outwardlyto join the surface of the spheroidal portion, said conoidal extensionshaving rounded ends and substantially cylindrical body portions betweensaid rounded ends and said spheroidal portion.

JOSEPH o. ANDREWS.

